[Amps] Rice Box Exciter to Collins 30S-1 & 30L-1

[R.Measures]

On Jul 7, 2004, at 6:50 AM, Joe Isabella wrote:

> Hi Roger!!
> I've been running "Rice Box" AM for some time now, and the trick is to=20=

> keep the drive below the point that rig distorts.  I know that all the=20=

> manuals say "40W on AM", but I've found that power level includes more=20=

> distortion than I like to see.  If you keep it down below 25W you'll=20=

> be in great shape.  In fact, I've talked to a few guys running the 756=20=

> series into an amp and they sound pretty good!
>
=F0  Indeed, Joe, when run properly (at a 4 to 1 ratio), low-level=20
modulated, linear-amplified AM has way less audible distortion that=20
traditional plate-modulated AM.

> The only caveat to this is that the amp must also be kept below it's=20=

> maximum PEP level, too.  If you use the 30L-1, that's 1000W PEP or=20
> APPROXIMATELY 250W carrier on AM.  You'd do well to reduce the 756's=20=

> output to keep it down to around 200-225W or so.  I used to drive a=20
> Kenwood TL-922 at about 250-300W carrier and it seemed quite happy at=20=

> that level.  I now have a Henry 3K-A, and it will easily go above the=20=

> APPROXIMATE "legal limit" of 375W carrier on AM.  I would bet your=20
> 30S-1 is similar in this regard..  I simply reduce the drive until I=20=

> see around that level and all is well.  In case you haven't caught on=20=

> yet, the "rule of thumb" is power out in PEP is approximately equal to=20=

> AM carrier x4.  It totally depends on the audio (sideband) levels=20
> coming from the exciter.  I hope I'm not insulting you with=20
> oversimplified statements!!  Feel free to contact me off-line if you=20=

> want to discuss this more.  BTW, I now run a Ten-Tec Jupiter with my=20=

> Henry for an all made in the USA shac
>  k.  I
>  guess you could call it a "Wheat Box" instead (??).  :-)
>
> Also, I live a little north of you in the DFW area, so we could easily=20=

> setup a sked if you like.  I currently have my shack disassembled, but=20=

> it will be back up by the weekend.
>
> Best of luck and 73!!
> Joe, N3JI
> Lewisville, TX
>
>
> Roger Agnew <k1kq at motorhomesusa.com> wrote:
> I would like to get on an AM Net tomorrow with my Icom 756 Pro driving=20=

> my Collins 30S-1 or 30L-1. Does anyone know or could guide me to a=20
> source of information to properly drive these amps with the Icom 756=20=

> Pro.
>
>
> Roger Agnew
> K1KQ - Austin, TX
> 888-536-5500
>
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> 	=09
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Richard L. Measures, AG6K, 805.386.3734.  www.somis.org